package com.pu.service.impl;

import com.pu.dto.GoodsSalesDTO;
import com.pu.entity.Orders;
import com.pu.mapper.OrderMapper;
import com.pu.mapper.UserMapper;
import com.pu.service.ReportService;
import com.pu.service.WorkspaceService;
import com.pu.vo.*;
import org.apache.commons.lang.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

/**
 * @Author Yusc
 * @Date 2023/11/5 23:33
 * @Version
 * @Description 可视化报表
 **/
@Service
public class ReportServiceImpl implements ReportService {
    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WorkspaceService workspaceService;

    /**
     * @auther: Yusc
     * @date 2023/11/5 23:38
     * @Description 根据时间区间统计营业额
     */
    @Override
    public TurnoverReportVO getTurnover(LocalDate begin, LocalDate end) {
        // 1、计算中间时间，将其放在列表中
        List<LocalDate> dateList = timeInBetween(begin, end);

        // 2、计算每天的营业额(订单状态为”已完成“的订单额合计)
        List<Double> turnoverList = new ArrayList<>();  // 存放营业额的列表
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);    // 当天起始时间
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);      // 当天结束时间
            Map map = new HashMap();
            map.put("status", Orders.COMPLETED);
            map.put("begin", beginTime);
            map.put("end", endTime);
            Double turnover = orderMapper.sumByMap(map);
            turnover = turnover == null ? 0.0 : turnover;   // 判断是否为空
            turnoverList.add(turnover);
        }
        // 数据封装
        return TurnoverReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .turnoverList(StringUtils.join(turnoverList, ","))
                .build();

    }

    /**
     * @auther: Yusc
     * @date 2023/11/6 16:38
     * @Description 根据时间区间统计用户数量
     */
    @Override
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        // 1、计算中间时间，将其放在列表中
        List<LocalDate> dateList = timeInBetween(begin, end);

        List<Integer> newUserList = new ArrayList<>();      // 新增用户数
        List<Integer> totalUserList = new ArrayList<>();    // 总用户数

        // 3、统计每天：新增用户数 和 总用户数 并将其添加到列表中
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            //新增用户数量 select count(id) from user where create_time > ? and create_time < ?
            Integer newUser = getUserCount(beginTime, endTime);
            //总用户数量 select count(id) from user where  create_time < ?
            Integer totalUser = getUserCount(null, endTime);

            newUserList.add(newUser);
            totalUserList.add(totalUser);
        }
        return UserReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .newUserList(StringUtils.join(newUserList, ","))
                .totalUserList(StringUtils.join(totalUserList, ","))
                .build();
    }

    /**
     * @auther: Yusc
     * @date 2023/11/6 18:36
     * @Description 根据时间区间统计订单数量
     */
    @Override
    public OrderReportVO getOrderStatistics(LocalDate begin, LocalDate end) {
        // 1、计算中间时间，将其放在列表中
        List<LocalDate> dateList = timeInBetween(begin, end);

        List<Integer> orderCountList = new ArrayList<>();   //每天订单总数集合
        List<Integer> validOrderCountList = new ArrayList<>();  //每天有效订单数集合
        // 将每天的总订单数 和 每天的有效订单数 查询出来放入列表中
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            // select count(id) from orders where order_time > ? and order_time < ?
            Integer orderCount = getOrderCount(beginTime, endTime, null);
            // select count(id) from orders where order_time > ? and order_time < ? and status = ?
            Integer validOrderCount = getOrderCount(beginTime, endTime, Orders.COMPLETED);

            orderCountList.add(orderCount);
            validOrderCountList.add(validOrderCount);
        }

        // 时间区间内的总订单数
        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();
        // 时间区间内的总有效订单数
        Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();
        //订单完成率
        Double orderCompletionRate = 0.0;
        if (totalOrderCount != 0) {
            orderCompletionRate = validOrderCount.doubleValue() / totalOrderCount;
        }

        return OrderReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .orderCountList(StringUtils.join(orderCountList, ","))
                .validOrderCountList(StringUtils.join(validOrderCountList, ","))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }

    /**
     * @Description 查询指定时间区间内的销量排名top10
     */
    @Override
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);
        List<GoodsSalesDTO> goodsSalesDTOList = orderMapper.getSalesTop10(beginTime, endTime);

        String nameList = StringUtils.join(goodsSalesDTOList.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList()), ",");
        String numberList = StringUtils.join(goodsSalesDTOList.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList()), ",");

        return SalesTop10ReportVO.builder()
                .nameList(nameList)
                .numberList(numberList)
                .build();
    }

    /**
     * @auther: Yusc
     * @date 2023/11/10 12:30
     * @Description 导出运营数据报表
     */
    @Override
    public void exportBusinessData(HttpServletResponse response) {
        LocalDate begin = LocalDate.now().minusDays(30);    //获取30天前的日期
        LocalDate end = LocalDate.now().minusDays(1);   // 获取昨天的日期
        // 1、查询概览运营数据(近30天的)，提供给Excel模板文件
        BusinessDataVO businessData = workspaceService.getBusinessData
                (LocalDateTime.of(begin, LocalTime.MIN), LocalDateTime.of(end, LocalTime.MAX));

        // 2、通过输入流获取运营模板的excel表
        InputStream inputStream = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");
        try {
            // 基于提供好的模板文件创建一个新的Excel表格对象
            XSSFWorkbook excel = new XSSFWorkbook(inputStream);
            // 获得Excel文件中的一个Sheet页
            XSSFSheet sheet = excel.getSheet("Sheet1");
            // 向运营数据报表写入中写入数据
            sheet.getRow(1).getCell(1).setCellValue(begin + "至" + end);
            XSSFRow row = sheet.getRow(3);  //获得第4行
            //获取单元格
            row.getCell(2).setCellValue(businessData.getTurnover());
            row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessData.getNewUsers());

            row = sheet.getRow(4);      //获得第5行
            row.getCell(2).setCellValue(businessData.getValidOrderCount());
            row.getCell(4).setCellValue(businessData.getUnitPrice());

            //每日明细数据明细数据
            for (int i = 0; i < 30; i++) {
                LocalDate date = begin.plusDays(i); // 往后加一天日期

                businessData = workspaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));
                row = sheet.getRow(7 + i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessData.getTurnover());
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData.getUnitPrice());
                row.getCell(6).setCellValue(businessData.getNewUsers());
            }
            //通过输出流将文件下载到客户端浏览器中
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);
            //关闭资源
            out.flush();
            out.close();
            excel.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    /**
     * @auther: Yusc
     * @date 2023/11/6 18:41
     * @Description 根据时间区间统计指定状态的订单数量
     */
    private Integer getOrderCount(LocalDateTime beginTime, LocalDateTime endTime, Integer status) {
        Map map = new HashMap();
        map.put("status", status);
        map.put("begin", beginTime);
        map.put("end", endTime);
        return orderMapper.countByMap(map);
    }

    /**
     * @param beginTime 起始完整时间
     * @param endTime   结束完整时间
     * @auther: Yusc
     * @date 2023/11/6 16:51
     * @Description 根据时间区间统计用户数量
     */
    private Integer getUserCount(LocalDateTime beginTime, LocalDateTime endTime) {
        Map map = new HashMap();
        map.put("begin", beginTime);
        map.put("end", endTime);
        return userMapper.countByMap(map);
    }


    /**
     * @param begin 开始日期
     * @param end   结束日期
     * @auther: Yusc
     * @date 2023/11/6 16:40
     * @Description 计算中间时间，将其放在列表中
     */
    private List<LocalDate> timeInBetween(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)) {
            begin = begin.plusDays(1);//日期计算，获得指定日期后1天的日期
            dateList.add(begin);
        }
        return dateList;
    }
}
